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Membrane control type sustained-release improving agent suitable for southern acid red soil and preparation method of improving agent

A membrane-controlled, acid red technology, applied in chemical instruments and methods, soil conditioning materials, other chemical processes, etc., can solve the problems of local pH surge at the soil fertilization point, reducing the effectiveness of phosphate fertilizers, and mineral nutrient loss, etc. Conducive to the continuous absorption of nutrients, improving the effectiveness of phosphate fertilizers, and reducing the toxicity of aluminum in red soil

Pending Publication Date: 2018-11-02
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the red soil ecosystem is facing the following severe problems: First, the rapid development of industrialization and urbanization has resulted in increased acid deposition and the extensive use of ammonium nitrogen fertilizers in agricultural production, which has intensified the acidification of red soil, which not only makes potassium, calcium, The loss of magnesium, molybdenum, boron and other nutrient elements also increases the activity of heavy metals in red soil and increases the toxicity to plants. Moreover, soil acidification will also affect the activities of soil microorganisms, reduce the number and activity of microorganisms, and affect the organic matter in the soil. Decomposition and transformation; second, the traditional clear tillage farming method leads to continuous consumption of soil organic matter, loss of mineral nutrients, reduced soil fertility, and even makes some red soil areas uncultivable; third, red soil is severely impoverished, and the supply of N, P, and K nutrients Insufficient, a variety of medium and trace elements are lacking, and the fertilization effect is poor due to the characteristics of red soil. For example, the application of phosphate fertilizer is easily fixed by Fe and Al in acidic soil, resulting in a decrease in the effectiveness of phosphate fertilizer. The lack of nutrients and low fertilizer utilization rate make Low yield and poor quality crops in most red soil areas
[0004] Studies have found that although the above-mentioned powerful acid-modifying substances can quickly increase the pH of red soil, reduce the content of exchangeable iron and aluminum in red soil, reduce the fixation of iron and aluminum on phosphorus and the corresponding precipitation, but the strong acid-modifying substances will also be dissolved in a short period of time. Concentrated and rapid release of a large amount of calcium ions or magnesium ions will cause a local pH surge at the soil fertilization point, which will easily cause the phosphate ions released from the fertilizer to form calcium phosphate precipitation or magnesium phosphate precipitation with calcium ions or magnesium ions, reducing the effectiveness of phosphate fertilizers. Induce or accelerate soil compaction, destroy the soil aggregate structure, and make the soil surface hard under the action of cohesive force, and soil compaction often leads to poor soil air permeability, difficult elongation of crop roots, poor water permeability and water retention, and reduced ability to resist floods and droughts, eventually causing lower crop yields

Method used

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  • Membrane control type sustained-release improving agent suitable for southern acid red soil and preparation method of improving agent
  • Membrane control type sustained-release improving agent suitable for southern acid red soil and preparation method of improving agent

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Experimental program
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Effect test

Embodiment 1

[0038] The raw material composition of quick-release layer in the present embodiment is: biochar 1.2kg, magnesium oxide 4.5kg, silicon calcium magnesium potassium mineral fertilizer 0.2kg, binder is: hypromellose 0.15kg, sodium carboxymethylcellulose 0.15kg and water 1.2kg.

[0039] The raw materials of film-controlled slow-release granules are: biochar 3.85kg, ammonium phosphate 22.68kg, silicon calcium magnesium potassium mineral fertilizer 0.790kg, binders: hypromellose 0.85kg, carboxymethylcellulose sodium 0.85 kg and 6.8kg of water, the coated slow-release materials are: ethyl cellulose 2.05kg, chitosan 5.47kg, dibutyl phthalate 1.09kg and water 2.73kg.

[0040] The preparation method of the film-controlled slow-release improver suitable for southern acidic red soil comprises the following steps:

[0041] (1) Preparation of membrane-controlled slow-release granule raw material mixture powder: the raw material biochar, phosphorus-containing material and silicon-calcium-ma...

Embodiment 2

[0047] The raw material composition of quick-release layer in the present embodiment is: biochar 2.9kg, calcium oxide 3.8kg, silicon calcium magnesium potassium mineral fertilizer 1.0kg, binder is: hypromellose 0.04kg, sodium carboxymethylcellulose 0.04kg and water 1.92kg.

[0048] The raw materials of film-controlled slow-release granules are: biochar 7.68kg, ammonium phosphate 17.28kg, silicon calcium magnesium potassium mineral fertilizer 1.92kg, binders: hypromellose 0.15kg, carmellose sodium 0.15kg kg and 7.37kg of water, the coated slow-release materials are: ethyl cellulose 1.69kg, chitosan 3.17kg, dibutyl phthalate 1.06kg and water 1.76kg.

[0049] The preparation method of the film-controlled slow-release improver suitable for southern acidic red soil comprises the following steps:

[0050] (1) Preparation of membrane-controlled slow-release granule raw material mixture powder: the raw material biochar, phosphorus-containing material and silicon-calcium-magnesium-pot...

Embodiment 3

[0056] The raw material composition of quick release layer in the present embodiment is: biochar 1.5kg, magnesia 3.0kg, silicon calcium magnesium potassium mineral fertilizer 0.5kg, binder is: hypromellose 0.025kg, sodium carboxymethyl cellulose 0.05kg and water 1.275kg.

[0057] The raw materials of film-controlled slow-release granules are: 6.36kg of biochar, 12.72kg of ammonium phosphate, 2.12kg of silicon calcium magnesium potassium mineral fertilizer, and the binders are: 0.10kg of hypromellose, 0.20kg of sodium carboxymethylcellulose kg and 5.0 kg of water, and the coated slow-release materials are: ethyl cellulose 0.96 kg, chitosan 2.40 kg, dibutyl phthalate 0.72 kg and water 1.20 kg.

[0058] The preparation method of the film-controlled slow-release improver suitable for southern acidic red soil comprises the following steps:

[0059] (1) Preparation of membrane-controlled slow-release granule raw material mixture powder: the raw material biochar, phosphorus-containi...

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Abstract

The invention relates to the technical field of soil improvement, and discloses a membrane control type sustained-release improving agent suitable for southern acid red soil and a preparation method of the improving agent. The membrane control type sustained-release improving agent comprises membrane control type sustained-release particles, and a rapid release layer which covers the surfaces of the membrane control type sustained-release particles; the rapid release layer comprises 10-30 parts by weight of charcoal, 30-45 parts by weight of an acid modified substance, 2-10 parts by weight ofsilicon calcium magnesium potassium mineral fertilizer, and 5-20 parts by weight of an adhesive; and the membrane control type sustained-release particles comprise 10-30 parts by weight of charcoal, 30-65 parts by weight of a phosphorus-bearing matter, 2-10 parts by weight of silicon calcium magnesium potassium mineral fertilizer, 5-27 parts by weight of an adhesive, and 2-32 parts by weight of amembrane coating type sustained-release material. The membrane control type sustained-release improving agent is capable of improving the efficiency of phosphatic fertilizer while reducing the soil acidity, improving the soil quality and increasing the crop output; in addition, the inner membrane control type sustained-release particles and the outer rapid release layer have the characteristics ofthe charcoal and the silicon calcium magnesium potassium mineral fertilizer, so that the agent can quickly exert an effect, and the soil improving period is shortened; and moreover, the agent can becontinuously released to improve the soil for a long term.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to a film-controlled slow-release improver suitable for southern acidic red soil and a preparation method thereof. Background technique [0002] Red soil spreads across thirteen provinces and regions in the south. It is one of the main soil types in southern my country and an important production area of ​​food crops and economic crops in my country. However, in recent years, the red soil ecosystem is facing the following severe problems: First, the rapid development of industrialization and urbanization has resulted in increased acid deposition and the extensive use of ammonium nitrogen fertilizers in agricultural production, which has intensified the acidification of red soil, which not only makes potassium, calcium, The loss of magnesium, molybdenum, boron and other nutrient elements also increases the activity of heavy metals in red soil and increases the toxicity to pl...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C09K17/40C09K101/00C09K109/00C05G3/80
CPCC05B7/00C05G3/00C09K17/40C09K2101/00C09K2109/00C05G3/80C05G5/12C05G5/30C05D1/04C05D5/00C05D9/00C05D3/02
Inventor 刘佳陈静蕊杨成春张杰秦文婧徐昌旭邱才飞谢杰王芳东夏文建
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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